TCB Cavity Barrier TCB Cavity Barrier
Fire product


  • Up to 60 minutes of fire integrity
  • Horizontal and vertical options
  • Can be used around window and door openings
  • Specified in terraced, semi-detached, apartments and major projects
  • Meets requirements of Robust Detail Part E and Approved Document B
  • Maximum cavity width available: 150mm
  • Easily installed
  • Third-party certificated by IFC


ARC TCB restricts the spread of smoke and flames within the cavity of timber frame walls, while also minimising the effect of flanking noise pollution. It is ideally suited for providing a cavity barrier within the external wall cavity, in line with a separating wall or floor, and around window and door openings, as specified in Approved Document B.

Key stats

Length supplied 1.2m
Third-party certification TCB: IFC certificate number: IFCC 1727 - Party Wall TCB: IFC certificate number: IFCC 1728
Insulation Non-combustible rockfibre mineral wool
Thermal conductivity 0.037W/mK
Fire rating Up to 60 minutes
Insulation performance 15 minutes
Test standard EN1366-4
Construction type Timber frame
Orientation Vertical or horizontal
Robust Detail compliance E-WT 1-4, E-FT 1-6

Frequently asked questions about this product

Can ARC TCB be used around window and door openings?

ARC TCB is ideal for providing a cavity barrier both at wall junctions and around window and door openings in timber frame constructions.

Can this product be used with an SFS internal leaf?

ARC TCB is fire rated and certified for use in a timber frame construction.

How do you install ARC TCBs?

Please follow the guidance on our datasheet and within our product video.

Do I take it out of the coloured sleeve?

The polythene sleeve is there to provide temporary fixing during construction, to enable product identification, and to offer protection from the elements and should therefore be left in place. It does not add to the performance of the product so can be safely cut in to, and the product can still be used should the polythene be damaged.

Do you have to install a separate DPC or cavity tray?

Typically a DPC will not be required in conjunction with a cavity barrier in a timber frame construction, as the timber kit will include a vapour control layer. Where this is not the case, the ARC TCB does not include an integral DPC, and therefore you should consider this in your design.

Can this cover multiple cavity sizes?

ARC TCBs are designed to suit specific cavity widths and are available in 5mm increments. It’s important that the appropriate size is fitted to achieve the required compression fit and to ensure the product performs as expected.

Industry awards and accreditations for this product

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